C618—4卧式车床电气的正反转控制见图1。图2所示为电气控制原理。它由操纵杆带动光杠上撬板,按动行程开关SQ_1、SQ_2分别使交流接触器KM_1、KM_2动作实现机床的正、反转控制。由于SQ_1、SQ_2触点通断行程短,外壳一般为胶质。光杠上键槽和键稍一磨损,使他们之间的问隙增大,起动就不可靠。滑板在运行中会出现起、停车现象,开关经常被撬坏,很不安全,维修频繁。 C618-4 horizontal lathe electrical reversing control shown in Figure 1. Figure 2 shows the principle of electrical control. It is driven by the joystick lever on the light lever, press the travel switch SQ_1, SQ_2 AC contactor KM_1, KM_2 action to achieve positive and negative control of machine tools. As SQ_1, SQ_2 contacts on-off short stroke, the shell is generally plastic. The light bar on the keyway and the key wear a little, so that the gap between them increases, the start is not reliable. Skateboard in operation will appear from the parking phenomenon, the switch is often pry bad, it is not safe, frequent maintenance.